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Blind hope

Elderly people in danger of going blind as a result of a common eye condition will receive an experimental treatment using human embryonic stem cells (hESCs). Advanced Cell Technology in Massachusetts has permission to treat dry age-related macular degeneration by injecting the eyes of 12 people with retinal cells made from hESCs.

Urban birds chirp up

Australian birds are calling more loudly in urban areas than in rural areas, suggesting they have evolved to better survive in noisy urban environments. The calls of silvereyes (Zosterops lateralis) are innate, not learned, so a change in call pitch …